Type-writer.



. No. 728,340. PATENTED MATH, 1903? c. WASMUTH.

TYPE WRITER.

APPLICATION FILED FEB. 16, 1903.

N0 MODEL.

"1mm"; v l am M44194? A 7 an.

Patented May 19, 1903.?

PATE T OFFICE.

CARL WASMUTH, OF cRiiNHoF, GERMANY.

TYPE-WRITER.

SPECIFICATION forming part of Letters Patent No. 72 8,340,dated May 19, 1903.

' Application filed February 16,1903. Serial No. 143,616. (No model.) a

To whom it may concern:

Be it known that LOARL WASMUTH, a citizen of the Empire of Germany, residing at ward and striking against the front of the platen. Hitherto the parts for actuating the type-levers in such type-writers were so arranged that for accelerating as much as pos-' sible the return movements of these parts I5 tensible or compressible springs were pro-I The exclusive use and application ofv'ided. springs for this purpose, however, produced various defects, chiefly from'the reason that the'tension of the springs is subjected" to alterations in time and that the type le "vers, especially'those which are mostly used, gradually became unreliable, owingtotheir springs giving'way. Then thepower required "fordepressing the dilferent keys would vary" 2 5 and the different type-levers would strike not uniformly, but irregular1y,against the paper on the platen. This ismost,objectionable, since the letters or charact'ers'printed off on the first sheet and the several copies there-- 0 beneath will be not uniformly distinct, those letters or characters prod'uc edby the typelevers struck" with, less force beingunore or less indistinct, the more so the largerthe number of the copies is; also, certain letters or characters will appear irregular as regards their-positions. These defects are to be avoided by the improved type-writer according to my invention in the manner that aconstant and invariable weight is chiefly employed for returning the keys and the type-levers, with the parts connected therewith, to theiij'initial positions, while a plurality of springs are provided merely to assist to a certain degree the action of the said weight. g A My improved type-writer is illustrated in the-accompanying drawing, which represents a longitudinal vertical section through the same, only such parts being shown .as is necessary for the understanding of the following description.-

Between the side parts of the machineframe 1 several horizontal rods or shafts 9,

10,11, and-12 are secured. On the l'owest'rod or shaft 12 severalsay two-tWo-armed 1evers 8 are mounted to rock,' whi ch carry the I rear arms 17 18 19 and with erect arms 5" 6 6o 7". On a rear axle 3 --two levers 3 near the side parts of the machine-frame 1 are fastened or mounted to rock. The front'ends .Of the two levers 3 are-bent'upward and-carry four horizontal rods'13, 14, 15, and 16, which are made to rest on the rear arms 17, 18, 19, and 20v of thekey-levers. Thus a rocking frame is formed by the two side levers 3 and thefour horizontalrods 13, 14, 15, and 16. 7 Two weak springs 33, attached on the lower 7:: ends to the machine-frame 1 and on the up-. per'ends to the front endsof the lovers 3, are{ employed forholding'the rocking frame. in 7 .its lower position, suitable studs or supports of anyknown kind and shape, but notshown, being arranged for limiting the downward movement of the rocking frame. -The springs :33 may, however, be dispensed with.

An arc-shaped bridge 2 issecured between the'tw'oside parts of the machine-frame 1 or 'in an'y other suitable manner. The bridge 2 isass'umed to be providedwith a plurality of radial slots 2 for the'type-l-evers, of which only three'21, 22, and 23-" are shown. The type-levers are mounted to turnf'on a curved rod'24, provided in the bridge-'2. I have not shown more particularly the construction of the bridge 2 and the manner-in which the curved rod 24 is introduced or placed in the bridge, as this is immaterial and there'ar'e 9c several well-known constructions to be selected. The front of the machine-frame 1 is on the inside provided with a-rib 35, curved to an arc of a circle for supporting the free ends of the type-levers. A pad 28 is placed 5 on this rib 35 for softening theshocksiofrthe type levers, and thus reducing the 'noise.. I The type-levers 22 23.324 areiprovided'with downwardlyprojecting arms 21 22? 23, which are pivotal-1y connected with-.the erect, Io: arms 5 6 7 by means of rods'25 26 27. Beneath these rods an arc-shaped support 29 is secured within the machine-frame 1, and the erect arms 5 6 7 are connected with this support 29 by means of springs 30 31 32, whereby the key-levers 5" 6 7 of the keys proper are normally held in their horizontal positions. The key-levers 8 of the spacekey 8 may be held in their normal horizontal positions by means of springs 36, connecting their rear arms 20 with the machine-frame 1. Then the key-levers 8 will bear against suitable pins or projections 8", provided on the machine-frame 1.

The carriage 3t, carrying the platen 4, is assumed to move on rails 37 and 38 by means of balls. The two rails 37 and 38 are carried by a suitable frame 39, which can be moved up and down vertically in any known manner for shifting the platen 4. For feedin the carriage 34 fromright to left a lever 33 is used in any known manner. This lever 3 is fastened on the axle 3 or rigidly connected with the levers 3 of the rocking frame.

The type-writer is operated in the following manner: On depressing any keyfor in stance, the key 6--its rear arm 18 Will raise the horizontal rod 14, and thereby also the rocking frame. At the same time the erect arm 6 of the key-lever 6 will by the rod 26 move the arm 22 so that the type-lever 22 will strike against the paper on the platen 4. On again releasing the key 6 the weight of the rocking frame will by the horizontal rod 14 bear on the rear arm 18, and thereby quickly return the key-lever 6, with the key 6 and the parts connected therewithviz., the erect arm 6 the rod 26, the arm 22, and the type-lever 22-to their initial positions. Thus the whole weight of the rocking frame, which is invariable, will act upon the rear arm of the single key-lever depressed. When any other key is depressed, similar occurrences will take place and the Weight of the rocking frame is again used for returning the respective movable parts to their initial positions. When the key 6 is depressed, the spring 31, connecting the erect arm 6" with the support 29, will also be strained and will then assist the Weight of the rocking frame to a certain degree in returning the parts to their initial positions. Preferably rests of some kind similar to the pins or projections 8 are provided on the support 29 or other parts of the machine-frame 1, against which the erect arms 5" 6 7 or the key-levers 5 6 7 bear under the action of the springs 30 31 32, respectively.

The mechanism described so far presents the essential advantage that an invariable force-i. e., the constant Weight of the rocking f rame-can be utilized mostly for accelerating the return movements of the movable parts, so that the type-levers can be relied upon to perform their duties regularly and uniformly and to print off their types well and distinctly.

The type-writer can be varied in its details without deviating from the spirit of my invention.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In a type-Writer, the combination with a plurality of key-levers provided with rear arms, of a platen, a plurality of type-levers arranged for turning upward and striking against the front of said platen, means for pivotally connecting said key-levers with said type-levers, means for yieldingly holding said key-levers in their normal horizontal positions, two levers turning around a rear horizontal axis, and a plurality of horizontal rods secured between said two levers and resting on said rear arms of said key-levers, substantially as set forth.

2. In a type-Writer, the combination with a plurality of horizontal shafts secured one above the other in the machine-frame, of a plurality of key-levers mounted to rock on said horizontal shafts and provided with rear arms, two levers turning around a rear horizontal axis, a plurality of horizontal rods secured between the front ends of said two levers and resting on said rear arms of said key-levers, the said key-levers excepting the space-key lever being provided with erect arms, a carriage with a platen, an arc-shaped bridge beneath said carriage, a plurality of type-levers mounted to turn on axes in said arc-shaped bridge and arranged for turning upward and striking against the front of said platen, the said type-levers being provided with arms projecting downward and radially with'respect to said arc-shaped bridge, a padcovered arc-shaped support for supporting, the free ends of said type-levers, a plurality of rods pivotally connecting said arms of said type-levers with said erect arms of said keylevers, and means for yieldingly holding said key-levers in their normal horizontal positions, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CARL WASMUTI-I.

Witnesses:

HERMANN J. ARAN, HANS HILDEBRAND. 

